Question 1

Which of the following is NOT a function of skeletal muscle tissue?

Accepted Answer

Storing calcium for bone growth

Question 2

Which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 3

During the sliding filament theory of muscle contraction, which of the following occurs?

Accepted Answer

Thin filaments slide toward the M line

Question 4

What is the role of calcium ions ($$Ca^{2+}) in $$muscle contraction?

Accepted Answer

They bind to troponin, causing tropomyosin to move and expose active sites on actin

Question 5

Which of the following best describes the sequence of events at the neuromuscular junction leading to muscle contraction?

Accepted Answer

Action potential → ACh release → ACh binds to receptors → Na$$^+$$ influx → muscle action potential

Question 6

A patient is experiencing muscle weakness due to a lack of ATP. Which step in the contraction cycle would be directly affected?

Accepted Answer

Cross-bridge detachment

Question 7

Which type of muscle contraction occurs when muscle tension increases but the muscle does not change length?

Accepted Answer

Isometric

Question 8

Which of the following best explains why rigor mortis occurs after death?

Accepted Answer

Ion pumps cease to function, $$Ca^{2+}$$ builds up, and no ATP is available to detach cross-bridges

Question 9

A myogram shows a single muscle twitch with a latent period, contraction phase, and relaxation phase. What occurs during the latent period?

Accepted Answer

The action potential propagates along the sarcolemma and calcium is released

Question 10

Which of the following is a property of fast muscle fibers?

Accepted Answer

Rapid contraction and quick fatigue

Question 11

During a bicep curl, as you lift the weight, which type of contraction is occurring in the biceps brachii?

Accepted Answer

Isotonic concentric

Question 12

Which of the following best describes the energy source used by skeletal muscle at rest?

Accepted Answer

Aerobic metabolism of fatty acids

Question 13

Which muscle tissue type is characterized by intercalated discs and is found only in the heart?

Accepted Answer

Cardiac muscle

Question 14

A marathon runner would likely have a higher proportion of which muscle fiber type in their leg muscles?

Accepted Answer

Slow fibers

Question 15

Which of the following is true regarding smooth muscle tissue?

Accepted Answer

It has a single, central nucleus and no T tubules

Question 16

Which of the following best describes the effect of increasing the load on a muscle during contraction?

Accepted Answer

The muscle shortens less and takes longer to begin shortening

Question 17

Which of the following is a characteristic of cardiac muscle tissue but NOT skeletal muscle tissue?

Accepted Answer

Intercalated discs

Question 18

Which process allows creatine phosphate (CP) to help maintain ATP levels during the initial seconds of muscle contraction?

Accepted Answer

CP donates a phosphate group to ADP to form ATP

Question 19

Which of the following best explains why muscle fatigue occurs during intense exercise?

Accepted Answer

Accumulation of metabolic byproducts and depletion of fuel

Question 20

Which of the following is a correct statement about the length-tension relationship in skeletal muscle?

Accepted Answer

Maximum tension is produced when sarcomeres are at 75% to 130% of their optimal length

Muscle Tissue: Structure, Function, and Types

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